As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS APU AIR BLEED FAULT ACCOMPANIED WITH STRANGE ODOR F/A IDENTIFIED AS BURNT CRAYON. MAINTENANCE DETERMINED THE CAUSE TO BE FROM THE APU (INTERNAL OIL LEAK), AN APU CHANGE HAS BEEN DECLARED. ***SUPPLEMENTAL INFORMATION: MAINTENANCE REMOVED AND REPLACED APU IAW CARD 26L31049003. NO FURTHER ODORS NOTED.*** (CLOSED)